You have been subscribed to a public bug: Since I've updated to 14.04 I'm unable to use a dual monitor setup. When I connect the external monitor using an Apple VGA display port adapter both screens flicker and get garbled images.
Software info: #uname -a Linux ldavim-MacBookPro 3.13.0-21-generic #43-Ubuntu SMP Mon Mar 31 22:52:24 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux Hardware info: #sudo dmidecode -s system-product-name MacBookPro9,2 #lspci | grep -i vga 00:02.0 VGA compatible controller: Intel Corporation 3rd Gen Core processor Graphics Controller (rev 09) #grep -i intel /var/log/Xorg.0.log | grep -i graphics [ 28.392] (II) intel: Driver for Intel(R) Integrated Graphics Chipsets: [ 28.409] (II) intel: Driver for Intel(R) HD Graphics: 2000-5000 [ 28.409] (II) intel: Driver for Intel(R) Iris(TM) Graphics: 5100 [ 28.409] (II) intel: Driver for Intel(R) Iris(TM) Pro Graphics: 5200 [ 28.493] (--) intel(0): Integrated Graphics Chipset: Intel(R) HD Graphics 4000 #dmesg | grep -i intel [ 0.000000] Intel GenuineIntel [ 0.083538] smpboot: CPU0: Intel(R) Core(TM) i5-3210M CPU @ 2.50GHz (fam: 06, model: 3a, stepping: 09) [ 0.085690] Performance Events: PEBS fmt1+, 16-deep LBR, IvyBridge events, full-width counters, Intel PMU driver. [ 3.045095] intel_idle: MWAIT substates: 0x21120 [ 3.045096] intel_idle: v0.4 model 0x3A [ 3.045097] intel_idle: lapic_timer_reliable_states 0xffffffff [ 16.566496] fb: conflicting fb hw usage inteldrmfb vs EFI VGA - removing generic driver [ 16.781552] fbcon: inteldrmfb (fb0) is primary device [ 17.318068] i915 0000:00:02.0: fb0: inteldrmfb frame buffer device [ 17.329286] snd_hda_intel 0000:00:1b.0: enabling device (0000 -> 0002) [ 17.329426] snd_hda_intel 0000:00:1b.0: irq 49 for MSI/MSI-X [ 17.765675] intel_rapl: domain uncore energy ctr 15288:15288 not working, skip [ 17.804152] input: HDA Intel PCH HDMI/DP,pcm=8 as /devices/pci0000:00/0000:00:1b.0/sound/card0/input12 [ 17.804214] input: HDA Intel PCH HDMI/DP,pcm=7 as /devices/pci0000:00/0000:00:1b.0/sound/card0/input11 [ 17.804258] input: HDA Intel PCH HDMI/DP,pcm=3 as /devices/pci0000:00/0000:00:1b.0/sound/card0/input10 [ 17.804300] input: HDA Intel PCH Headphone as /devices/pci0000:00/0000:00:1b.0/sound/card0/input9 [ 1908.293462] Modules linked in: hid_magicmouse hidp nvram pci_stub vboxpci(OF) vboxnetadp(OF) vboxnetflt(OF) vboxdrv(OF) cmac rmd160 crypto_null camellia_generic camellia_aesni_avx_x86_64 camellia_x86_64 cast6_avx_x86_64 cast6_generic cast5_avx_x86_64 cast5_generic cast_common deflate cts ctr gcm ccm serpent_avx_x86_64 serpent_sse2_x86_64 serpent_generic blowfish_generic blowfish_x86_64 blowfish_common twofish_generic twofish_avx_x86_64 twofish_x86_64_3way xts twofish_x86_64 twofish_common xcbc sha256_ssse3 sha512_ssse3 des_generic xfrm_user ah6 ah4 esp6 esp4 xfrm4_mode_beet xfrm4_tunnel tunnel4 xfrm4_mode_tunnel xfrm4_mode_transport xfrm6_mode_transport xfrm6_mode_ro xfrm6_mode_beet xfrm6_mode_tunnel ipcomp ipcomp6 xfrm6_tunnel tunnel6 xfrm_ipcomp af_key xfrm_algo btusb uvcvideo hid_appleir videobuf2_vmalloc videobuf2_memops bcm5974 videobuf2_core videodev bnep snd_hda_codec_hdmi rfcomm snd_hda_codec_cirrus intel_rapl x86_pkg_temp_thermal bluetooth intel_powerclamp coretemp snd_hd a_intel joydev kvm_intel kvm snd_hda_codec applesmc input_polldev snd_hwdep snd_pcm i915 snd_page_alloc lib80211_crypt_tkip snd_seq_midi snd_seq_midi_event snd_rawmidi crct10dif_pclmul crc32_pclmul wl(POF) drm_kms_helper drm lib80211 ghash_clmulni_intel aesni_intel cfg80211 aes_x86_64 snd_seq mei_me lrw snd_seq_device dm_multipath gf128mul scsi_dh glue_helper snd_timer mei i2c_algo_bit lpc_ich ablk_helper snd cryptd soundcore apple_gmux mac_hid video apple_bl binfmt_misc lp parport hid_generic hid_apple usbhid hid ahci libahci firewire_ohci sdhci_pci dm_mirror firewire_core sdhci dm_region_hash crc_itu_t dm_log tg3 ptp pps_core --- ApportVersion: 2.14-0ubuntu1 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: ldavim 2862 F.... pulseaudio CurrentDesktop: Unity DistroRelease: Ubuntu 14.04 HibernationDevice: RESUME=UUID=ad5654e7-d5b8-472c-aea3-55e999c6ba21 InstallationDate: Installed on 2013-10-21 (162 days ago) InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1) MachineType: Apple Inc. MacBookPro9,2 NonfreeKernelModules: wl Package: linux (not installed) ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-21-generic root=UUID=2cf32f84-e97a-49b5-980d-3d27ef5d15e2 ro video=vesafb:off quiet splash vt.handoff=7 ProcVersionSignature: Ubuntu 3.13.0-21.43-generic 3.13.8 RelatedPackageVersions: linux-restricted-modules-3.13.0-21-generic N/A linux-backports-modules-3.13.0-21-generic N/A linux-firmware 1.127 Tags: trusty Uname: Linux 3.13.0-21-generic x86_64 UpgradeStatus: Upgraded to trusty on 2014-03-28 (4 days ago) UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo _MarkForUpload: True dmi.bios.date: 08/08/2012 dmi.bios.vendor: Apple Inc. dmi.bios.version: MBP91.88Z.00D3.B08.1208081132 dmi.board.asset.tag: Base Board Asset Tag# dmi.board.name: Mac-6F01561E16C75D06 dmi.board.vendor: Apple Inc. dmi.board.version: MacBookPro9,2 dmi.chassis.type: 10 dmi.chassis.vendor: Apple Inc. dmi.chassis.version: Mac-6F01561E16C75D06 dmi.modalias: dmi:bvnAppleInc.:bvrMBP91.88Z.00D3.B08.1208081132:bd08/08/2012:svnAppleInc.:pnMacBookPro9,2:pvr1.0:rvnAppleInc.:rnMac-6F01561E16C75D06:rvrMacBookPro9,2:cvnAppleInc.:ct10:cvrMac-6F01561E16C75D06: dmi.product.name: MacBookPro9,2 dmi.product.version: 1.0 dmi.sys.vendor: Apple Inc. ** Affects: xserver-xorg-video-intel (Ubuntu) Importance: Undecided Status: New ** Tags: apport-collected bot-comment trusty -- dual head broken in 14.04 macbook pro https://bugs.launchpad.net/bugs/1301398 You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xserver-xorg-video-intel in Ubuntu. _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp